Electrochemical and ex situ XRD studies of a LiMn1.5Ni0.5O4 high-voltage cathode material

被引:47
作者
Wu, HM [1 ]
Tu, JP [1 ]
Yuan, YF [1 ]
Li, Y [1 ]
Zhao, XB [1 ]
Cao, GS [1 ]
机构
[1] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China
基金
中国国家自然科学基金;
关键词
spinel LiMn1.5Ni0.5O4; spray-drying method; ex situ XRD; lithium ion batteries;
D O I
10.1016/j.electacta.2005.01.026
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Sub-micro spinel-structured LiMn1.5Ni0.5O4 material was prepared by a spray-drying method. The electrochemical properties of LiMn1.5Ni0.5O4 were investigated using Li ion model cells, Li/LiPF6 (EC+DMC)/LiMn1.5Ni0.5O4. It was found that the first reversible capacity was about 132 mAh g(-1) in the voltage range of 3.60-4.95 V. Ex situ X-ray diffraction (XRD) analysis had been used to characterize the first charge/discharge process of the LiMn1.5Ni0.5O4 electrode. The result suggested that the material configuration maintained invariability. At room temperature, on cycling in high-voltage range (4.50-4.95 V) and low-voltage range (3.60-4.50 V), the discharge capacity of the material was about 100 and 25 mAh g(-1), respectively, and the spinet LiMn1.5Ni0.5O4 exhibited good cycle ability in both voltage ranges. However, at high temperature, the material showed different electrochemical characteristics. Excellent electrochemical performance and low material cost make this spinel compound an attractive cathode for advanced lithium ion batteries. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4104 / 4108
页数:5
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